Messages in this thread | | | Date | Wed, 3 Jul 2002 14:35:54 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: kernel timers vs network card interrupt |
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On Wed, 3 Jul 2002, Xinwen - Fu wrote:
> Hi, all, > I'm curious that if a network card interrupt happens at the same > time as the kernel timer expires, what will happen? > > It's said the kernel timer is guaranteed accurate. But if > interrupts are not masked off, the network interrupt also should get > response when a kernel timer expires. So I don't know who will preempt > who. > > Thanks for information! > > Xinwen Fu
The highest priority interrupt will get serviced first. It's the timer. Interrupts are serviced in priority-order. Hardware "remembers" which ones are pending so none are lost if some driver doesn't do something stupid.
Cheers, Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
Windows-2000/Professional isn't.
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